问题
单项选择题
He promised me a letter; he ought to ______ it days ago.
A. have written
B. write
C. had written
D. be writing
答案
参考答案：A
解析：ought to have done sth.意为“原本应该做某事(但却没做)”。
搜题请搜索小程序“爱下问搜题”
He promised me a letter; he ought to ______ it days ago.
A. have written
B. write
C. had written
D. be writing
参考答案：A
解析：ought to have done sth.意为“原本应该做某事(但却没做)”。